A Profit-Maximizing Firm Will Continue to Hire Labour Until the

A profit-maximizing firm will continue to hire labour until the

A) wage rate equals the marginal product of the last worker hired.
B) value of marginal product of the last worker hired is maximized.
C) value of marginal product of the last worker hired is negative.
D) wage rate equals the value of marginal product of the last worker hired.
E) value of marginal product of the last worker hired equals zero.